Spring整合Mybatis分析(注解方式)
配置文件更改解析

注解整合MyBatis分析
1、业务类使用注解形式声明bean,属性采用注解注入
2、建立独立的配置管理类,分类管理外部资源,根据功能进行分类,并提供对应的方法获取bean
3、使用注解形式启动bean扫描,加载所有注解配置的资源(bean)
4、使用AnnotationConfigApplicationContext对象加载所有的启动配置类,内部使用导入方式进行关联
注解整合MyBatis步骤
1.修改mybatis外部配置文件格式为注解格式
2.业务类使用@Component声明bean,使用@Autowired注入对象
3.建立配置文件JDBCConfig与MyBatisConfig类,并将其导入到核心配置类SpringConfig
4.开启注解扫描
5.使用AnnotationConfigApplicationContext对象加载配置项
Spring整合Junit
如何在Junit中使用spring中的资源?
1. Spring接管Junit的运行权,使用Spring专用的Junit类加载器
2.为Junit测试用例设定对应的spring容器
注意:
从Spring5.0以后,要求Junit的版本必须是4.12及以上。
Junit仅用于单元测试,不能将Junit的测试类配置成spring的bean,否则该配置将会被打包进入工程中。
Spring Junit坐标:
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
Spring Junit测试类:
package com.itheima.service;
import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.List;
//设定spring专用的类加载器
@RunWith(SpringJUnit4ClassRunner.class)
//设定加载的spring上下文对应的配置
@ContextConfiguration(classes = SpringConfig.class)
public class UserServiceTest {
@Autowired
private AccountService accountService;
@Test
public void testFindById(){
Account ac = accountService.findById(2);
// System.out.println(ac);
Assert.assertEquals("Jock1",ac.getName());
}
@Test
public void testFindAll(){
List<Account> list = accountService.findAll();
Assert.assertEquals(3,list.size());
}
}
Spring整合Mybatis代码(注解方式)
项目结构

pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.itheima</groupId>
<artifactId>Spring_day02_02</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.3</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.26</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.16</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
</dependencies>
</project>
jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring_db
jdbc.username=root
jdbc.password=123456
config包
JDBCConfig.java
package com.itheima.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import javax.sql.DataSource;
public class JDBCConfig {
@Value("${jdbc.driver}")
private String driver;
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.username}")
private String userName;
@Value("${jdbc.password}")
private String password;
@Bean("dataSource")
public DataSource getDataSource(){
DruidDataSource ds = new DruidDataSource();
ds.setDriverClassName(driver);
ds.setUrl(url);
ds.setUsername(userName);
ds.setPassword(password);
return ds;
}
}
MyBatisConfig.java
package com.itheima.config;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import javax.sql.DataSource;
public class MyBatisConfig {
@Bean
public SqlSessionFactoryBean getSqlSessionFactoryBean(@Autowired DataSource dataSource){
SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
ssfb.setTypeAliasesPackage("com.itheima.domain");
ssfb.setDataSource(dataSource);
return ssfb;
}
@Bean
public MapperScannerConfigurer getMapperScannerConfigurer(){
MapperScannerConfigurer msc = new MapperScannerConfigurer();
msc.setBasePackage("com.itheima.dao");
return msc;
}
}
SpringConfig.java
package com.itheima.config;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
@Configuration
@ComponentScan("com.itheima")
@PropertySource("classpath:jdbc.properties")
@Import({JDBCConfig.class,MyBatisConfig.class})
public class SpringConfig {
}
dao
AccountDao.java
package com.itheima.dao;
import com.itheima.domain.Account;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import org.mybatis.spring.SqlSessionFactoryBean;
import java.util.List;
public interface AccountDao {
@Insert("insert into account(name,money)values(#{name},#{money})")
void save(Account account);
@Delete("delete from account where id = #{id} ")
void delete(Integer id);
@Update("update account set name = #{name} , money = #{money} where id = #{id} ")
void update(Account account);
@Select("select * from account")
List<Account> findAll();
@Select("select * from account where id = #{id} ")
Account findById(Integer id);
}
domain
Account.java
package com.itheima.domain;
import java.io.Serializable;
public class Account implements Serializable {
private Integer id;
private String name;
private Double money;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Double getMoney() {
return money;
}
public void setMoney(Double money) {
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
service
AccountService.java
package com.itheima.service;
import com.itheima.domain.Account;
import java.util.List;
public interface AccountService {
void save(Account account);
void delete(Integer id);
void update(Account account);
List<Account> findAll();
Account findById(Integer id);
}
AccountServiceImpl.java
package com.itheima.service.impl;
import com.itheima.dao.AccountDao;
import com.itheima.domain.Account;
import com.itheima.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service("accountService")
public class AccountServiceImpl implements AccountService {
@Autowired
private AccountDao accountDao;
public void save(Account account) {
accountDao.save(account);
}
public void update(Account account){
accountDao.update(account);
}
public void delete(Integer id) {
accountDao.delete(id);
}
public Account findById(Integer id) {
return accountDao.findById(id);
}
public List<Account> findAll() {
return accountDao.findAll();
}
}
APP.java
import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import com.itheima.service.AccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App {
public static void main(String[] args) {
// ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
// AccountService accountService = (AccountService) ctx.getBean("accountService");
// Account ac = accountService.findById(2);
// System.out.println(ac);
ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
AccountService accountService = (AccountService) ctx.getBean("accountService");
Account ac = accountService.findById(2);
System.out.println(ac);
}
}
Junit
package com.itheima.service;
import com.itheima.config.SpringConfig;
import com.itheima.domain.Account;
import org.junit.Assert;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.List;
//设定spring专用的类加载器
@RunWith(SpringJUnit4ClassRunner.class)
//设定加载的spring上下文对应的配置
@ContextConfiguration(classes = SpringConfig.class)
public class UserServiceTest {
@Autowired
private AccountService accountService;
@Test
public void testFindById(){
Account ac = accountService.findById(2);
// System.out.println(ac);
Assert.assertEquals("Tom",ac.getName());
}
@Test
public void testFindAll(){
List<Account> list = accountService.findAll();
Assert.assertEquals(3,list.size());
}
}
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